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DRILL Collars
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Grant Prideco. All rights reserved. December 2003
Traceability
Drill collar material and process
traceability are maintained from
receipt of mill certified raw materi-
al to completion of all the manu-
facturing. Serial numbers are die
stamped on bar bodies.
Rigid Inspection Procedures
We inspect all our drill collars to
comply with API standards and
our own internal specifications.
These inspections include visual
dimensional checks as well as
ultrasonic inspections over the
entire body of the drill collar.
drill collars are manufactured from AISI
4142H-4145H modified steel, and are
supplied in the as rolled surface fin-
ish condition. Alternative surface finishes can be
provided. Drill collars are trepanned and drifted
to API Spec. 7 Latest Edition. Full-length heat-
treatment processes ensure that mechanical
properties meet or exceed API Spec. 7 Latest
Edition requirements.
A hardness range of285-341, Brinell
Hardness and Charpy V notch minimum
impact strength of40 ft-lb at 700F are guaran-
teed one inch below the surface.
tsl pps m by ss yll sp-
ms fmg h qums f h u aStM a370,
0.2% ffs mh. Hss ss pfm h od f ll
ll lls mpl wh u aStM ss.
Mls Mhl Pps
dll cll Mmum Mmum Mmumdm Yl Sgh tsl Sgh Hss
. ps ps BHn
3 1/8 thru 6 7/8 110,000 140,000 285
7 thru 11 100,000 135,000 285
MATERIALS
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98
API Connections
Grant Prideco drill collars are manufactured in30-ft and 31-ft lengths. All API connections
comply with dimensional requirements speci-
fied in API Spec. 7 Latest Edition and guidelines pre-
sented in API RP7G Latest Edition. Common sizes
and styles are summarized on the next page. In
addition, other connections such as OH, FH, PAC,
WO, SLH90, SH, and H90, are available to meet spe-
cific needs.
Phosphate Coating
All connections are phosphate-coated to improve
resistance to galling.
cl rllg
Drill collar thread roots, as well as elevator recessupper radii, are cold-rolled. Cold rolling creates a
compressive recess upper radii stress condition that
increases fatigue life by minimizing crack initiation.
th l-llg pss sss f m-
pssg ml fbs by ms f ll.
Stress Relief Features (SRF)Pin stress relief groove and API boreback box
API pin stress relief groove and API boreback box decrease the frequency of fatigue
failures. These features increase connection flexibility and reduce high-stress con-centrations that normally occur adjacent to the end of engaged threads. Stress
relief features are machined in compliance with API Spec. 7 Latest Edition.
As indicated in API Spec. 7 Latest Edition, connections NC23, NC26 (2 3/8 IF) and
NC31 (2 7/8 IF) do not have sufficient metal to accommodate stress relief features.
SrttM
Sss rlf th Fm
Grant Pridecos patented SRTTM modified
thread form can be applied to BHA connec-tions to reduce stress in the thread roots and
significantly improve connection fatigue life.
The stress reduction is accomplished by
machining an enlarged radius into the root
of the stab-flank thread. The SRTTM thread form
provides a larger reduction in stress level and
longer connection fatigue life than either the
API box stress relief groove or the boreback box feature.
aPi p sss lf gv
aPi bbk bx mv u-
gg hs hghly sss
s f h ll ll -
.
Grant Prideco. All rights reserved. December 2003
The enlarged root radius of the modi-
fied thread form reduces the stress
concentration at the thread root.
elg thr rus
aPi th Fm
G r a n t P r i d e c o
product specifications
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Drill collars are manufactured in compliance
with the following API standards:
aPi Spf 7 Ls e
aPi rmm P 7G Ls e
aPi Spf Q1 Ls e
dll cll dll cll B appxm S dsplm typl Bgnumb dm Lgh Wgh Mulus (p ) Sgh
(1) r
. . f lb/f. ( .3) US gl/f
NC 23-31 3 1/8 1 1/4 30 22.00 2.919 0.337 2.57:1
NC 26-35 (2 3/8 IF) 3 1/2 1 1/2 30 26.70 4.067 0.408 2.42:1
NC 31-41 (2 7/8 IF) 4 1/8 2 30 or 31 33.65 6.510 0.515 2.43:1
NC 35-47 4 3/4 2 30 or 31 46.81 10.191 0.716 2.58:1
NC 38-50 (3 1/2 IF) 5 2 1/4 30 or 31 53.29 11.769 0.815 2.38:1
NC 44-60 6 2 1/4 30 or 31 82.61 20.786 1.264 2.49:1
NC 44-60 6 2 13/16 30 or 31 75.90 20.182 1.161 2.84:1
NC 44-62 6 1/4 2 1/4 30 or 31 90.52 23.566 1.385 2.91:1
NC 46-62 (4 IF) 6 1/4 2 13/16 30 or 31 83.81 22.986 1.282 2.63:1
NC 46-65 (4 IF) 6 1/2 2 1/4 30 or 31 99.52 26.574 1.522 2.76:1
NC 46-65 (4 IF) 6 1/2 2 13/16 30 or 31 92.81 26.016 1.420 3.05:1
NC 46-67 (4 IF) 6 3/4 2 1/4 30 or 31 108.52 29.821 1.600 3.18:1
NC 50-70 (4 1/2 IF) 7 2 1/4 30 or 31 117.52 33.315 1.798 2.54:1
NC 50-70 (4 1/2 IF) 7 2 13/16 30 or 31 110.77 32.796 1.694 2.73:1
NC 50-72 (4 1/2 IF) 7 1/4 2 13/16 30 or 31 119.81 36.565 1.833 3.12:1
NC 56-77 73
/4 213
/16 30 or 31 139.90 44.906 2.140 2.70:1NC 56-80 8 2 13/16 30 or 31 150.81 49.498 2.307 3.02:1
6 5/8 API Reg 8 1/4 2 13/16 30 or 31 161.81 54.382 2.472 2.93:1
NC 61-90 9 2 13/16 30 or 31 195.81 70.887 2.995 3.17:1
7 5/8 API Reg 9 1/2 3 30 or 31 217.00 83.336 3.319 2.81:1
NC 70-97 9 3/4 3 30 or 31 230.00 90.179 3.518 2.57:1
NC 70-100 10 3 30 or 31 242.97 97.380 3.717 2.81:1
8 5/8 API Reg 11 3 30 or 31 299.00 129.948 4.574 2.84:1
n:(1) th umb (nc) s aPi wh h V- .065 h fm wh V- .038r h us. th
fs w gs h ph m f h h h ls w gs h us m f h ll ll.
dll cll d
+ 1/16-0
Summy f c Fea rsuls
Sss isy Ls egg Bx th r
(ps)
Ml dsp 10 deg/100 ft 20 deg/100ft
S Bx 171,734 240,087
aPi Sss rlf Gv Bx 160,528 220,717
aPi Bbk Bx 165,394 226,047
Mf th Fm 142,441 196,487
SRTTM
Stress Relief Thread Form
(Cont.)In addition to providing increased connection
fatigue life, SRTTM boxes reduce the overall
length required for recut by more than one
inch when compared to boxes with API stress
relief features.
API SPECIFICATIONS
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100 Grant Prideco. All rights reserved. December 2003
Grant Prideco offers optional slip and elevator
recesses to improve handling efficiency and safe-
ty. The upper radius of the elevator recess is cold-
rolled to increase product life. Slip and elevator recesses
can be used together or separately. Unless otherwise
specified, slip and elevator recesses are machined in
compliance with API RP7G Latest Edition guidelines.
3
r
cl Wk
Shul a
1
rus
Shul a
a
B
2
rus
c
2
rus3
3
16
18
20
c
B
a
G r a n t P r i d e c o
SLIP AND ELEVATOR RECESSES
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dll cll elv Slp elvdm rss rss rss
dm dm rus
a B c r
. . . .
41/8 3
11/16 3
3/4
1/8
43/4 4
1/4 4
3/8
1/8
5 41/2 4
5/8
1/8
6 53
/8 51
/21
/8
61/4 5
5/8 5
3/4
1/8
61/2 5
7/8 6
1/8
63/4 6 6
1/4
3/16
7 61/4 6
1/2
3/16
71/4 6
1/2 6 3/4
3/16
73/4 7 7
1/4
3/16
8 71/4 7
1/2
3/16
81/4 7
1/2 7 3/4
3/16
9 81/8 8
1/2
1/4
91/2 8
5/8 9
1/4
93/4 8
7/8 9
1/4
1/4
10 91/8 9
1/2
1/4
11 101/8 10
1/2
1/4
Slp elv rsss
While every effort has been made to insure the accuracy of the tables herein, this material is presented as a reference guide only. The technical informationcontained herein should not be construed as a recommendation. Grant Prideco cannot assume responsibility for the results obtained through the use of thismaterial. No expressed or implied warranty is intended.
d r i L L c o L L a r S
Grant Prideco. All rights reserved. December 2003
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102
Grant Prideco Offers Numerous Hardfacing
Options:
SMOOTHX
SuperSmoothX
Ganpdc1000SerieStmhadfacng
oh
Bx e whSlp rss oly
Grant Pridecos patented hardfacing that provides a smooth sur-
face with little or no exposed carbide.
Grant Pridecos patented solution for applications requiring a
machine-finished surface.
Fine Particle Tungsten-Carbide, applied either flush or raised,
provides economical protection in open hole applications.
Grant Prideco offers custom engineering hardfacing for specific
applications.
P eBx e wh
Slp elv rss
11
1
10
30 M.
101
1
10
4
G r a n t P r i d e c o
HARDFACING
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High Torque Applications
Grant Prideco Double Shouldered
connections (HT, XT, GPDS) are
patented, high-performance con-
nections that offers significantly more tor-
sional strength than standard API connec-
tions of similar size.
Spiral Drill Collars
Spiral drill collars are part of
Grant Pridecos complete product
line. Spiral grooves let mud cir-
culate freely around the drill collar to
equalize pressure and prevent a seal
from forming. This reduces the occur-
rence of differential pressure sticking.
Spl pvs f fl skg Whu Spl
Grant Prideco. All rights reserved. December 2003
DOUBLE SHOULDERED CONNECTIONS
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Sz typ dll cll B (.)
f c od 1 1 1/4 11/2 1
3/4 2 21/4 2
1/2 213/16
. f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f -lb BSr f-lb BSr
3 2,500 2.03 2,500 2.17 2,500 2.49
aPi nc 23 3 1/8 3,300 2.40 3,300 2.57 2,600 2.94
3 1/4 4,000 2.81 3,400 3.00 2,600 3.43 3 2,200 2.36 2,200 2.70 1,700 3.53
2 3/8 rgul 31/8 3,000 2.75 2,600 3.14 1,700 4.10
3 1/4 3,300 3.17 2,600 3.62 1,700 4.72
3 3,800 1.78 3,800 2.01 2,900 2.53
2 7/8 Pac 31/8 5,000 2.15 4,200 2.43 2,900 3.07
(S n 6) 3 1/4 5,200 2.55 4,200 2.88 2,900 3.63
2 3/8 IF
aPi nc 26 3 1/2 4,600 2.25 4,600 2.42 3,700 2.76
2 7/8 Slm Hl 33/4 5,500 2.96 4,700 3.18 3,700 3.64
3 1/2 3,800 2.27 3,800 2.42 3,800 2.73
2 7/8 rgul 33/4 5,800 2.91 5,000 3.10 4,000 3.49
3 7/8 5,800 3.26 5,000 3.48 4,000 3.91
2 7/8 XH 33/4 4,100 1.53 4,100 1.58 4,100 1.68
3 1/2 dbl Sml 37/8 5,400 1.76 5,400 1.82 5,400 1.93
2 7/8 M. op 41/8 8,100 2.26 8,100 2.34 7,400 2.48
3 7/8 4,600 1.54 4,600 1.59 4,600 1.69 4,600 1.85 4,600 2.16
2 7/8 iF 41/8 7,400 2.03 7,400 2.10 7,400 2.22 6,900 2.44 5,400 2.84
nc 31 4 1/4 8,900 2.29 8,900 2.37 8,200 2.51 6,900 2.75 5,400 3.21
3 1/2 Slm Hl 41/2 10,300 2.86 9,300 2.95 8,200 3.13 6,900 3.43 5,400 4.01
4 1/8
6,500 2.09 6,500 2.16 6,500 2.27 6,500 2.48 5,700 2.85
3 1/2 rgul 41/4 7,900 2.34 7,900 2.41 7,900 2.54 7,100 2.77 5,700 3.18
4 1/2 10,500 2.86 9,500 2.95 8,400 3.11 7,100 3.39 5,700 3.90
4 1/2 9,000 1.95 9,000 2.07 9,000 2.26 7,400 2.59
nc 35 4 3/4 12,300 2.44 10,800 2.58 9,200 2.82 7,400 3.24
5 12,300 2.97 10,800 3.14 9,200 3.43 7,400 3.95
4 1/4 5,200 1.31 5,200 1.37 5,200 1.48 5,200 1.68
3 1/2 XH 41/2 8,500 1.71 8,500 1.80 8,500 1.95 8,300 2.20
4 Slm Hl 4 3/4 12,100 2.16 11,800 2.27 10,100 2.46 8,300 2.77
3 1/2 M. op 5 13,300 2.65 11,800 2.79 10,100 3.01 8,300 3.40
51/4 13,300 3.18 11,800 3.35 10,100 3.62 8,300 4.08
4 3/4 10,000 1.73 10,000 1.80 10,000 1.92 10,000 2.10 8,300 2.54
3 1/2 iF 5 13,900 2.15 14,000 2.24 12,900 2.38 11,000 2.61 8,300 3.15
nc 38 5
1
/4 16,200 2.61 14,500 2.71 12,900 2.88 11,000 3.17 8,300 2.824 1/2 Slm Hl 5
1/2 16,200 3.10 14,500 3.23 12,900 3.43 11,000 3.77 8,300 4.54
ns: (aPi, rP7G Ls e)1. Basis of calculations for recommended make-up torque assumed the use of a thread compound containing 40% to 60% by weight of finely pow-
dered metallic zinc, or 60% by weight of finely powdered metallic lead, with no more than 0.3% total active sulfur (reference the caution regard-ing the use of hazardous materials in API Spec. 7 Latest Edition), applied thoroughly to all threads and shoulders. Also, the modified screw jackformula was used, as shown in the IADC Drilling Manual and the API Spec. RP7G Latest Edition and a unit stress of 62,500 psi in the box or pin,whichever is weaker. Torque values are rounded to the nearest 100 ft-lb.
2. Normal torque range is calculated value plus 10%. Higher torque values may be used under extreme condit ions.3. In each connection size and type group torque values apply to all connection types in the group, when used with the same dril l collar OD and bore
i.e. 2 3/8 API IF, API NC26 and 2 7/8 Slim Hole connections, used with 3 1/2 x 1 1/4 drill collars, all have the same minimum make-up torque of4600 ft-lbs and the box is the weaker member.
4. Stress-relief features are disregarded for make up torque calculation.5. H-90 connection make-up torque is based on 56,200 psi stress and other factors, as listed in note 1.6. 2 7/8 PAC make-up torque is based on 87,500 psi stress and other factors, as listed in note 1.7. Torque figures in bold indicate that the weaker member for the corresponding outside diameter and bore is the box. For all other torque values, the
weaker member is the pin.
f-lb (S n 2)
G r a n t P r i d e c o
Drill Collars Recommended Make-Up Torque and Bending Strength Ratios
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f-lb (S n 2)
Sz typ dll cll B (.)
f c od 1 3/4 2 21/4 2
1/2 213/16 3 3
1/4. f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr
4 3/4 8,800 1.46 8,800 1.51 8,800 1.59 8,800 1.71 8,800 1.99
3 1/2 H-90 5 12,800 1.83 12,800 1.89 12,800 1.99 12,800 2.15 10,400 2.49
(S n 5) 5 1/4 17,100 2.23 16,900 2.31 15,100 2.43 13,200 2.43 10,400 3.04
5 1/2 18,500 2.67 16,900 2.76 15,100 2.91 13,200 3.14 10,400 3.64
5 10,900 1.61 10,900 1.66 10,900 1.74 10,900 1.86 10,900 2.11
4 Full Hl 5 1/4 15,300 1.98 15,300 2.04 15,300 2.14 15,000 2.29 12,100 2.60
nc 40 5 1/2 20,000 2.38 18,900 2.46 17,000 2.57 15,000 2.75 12,100 3.12
4 M. op 5 3/4 20,500 2.62 18,900 2.91 17,000 3.04 15,000 3.25 12,100 3.70
4 1/2 dbl. Sml 6 20,500 3.29 18,900 3.39 17,000 3.55 15,000 3.79 12,100 4.31
5 1/4 12,600 1.47 12,600 1.51 12,600 1.56 12,600 1.64 12,600 1.80
51
/2 17,400 1.80 17,400 1.85 17,400 1.91 17,400 2.01 16,500 2.20 4 H-90 5 3/4 22,500 2.17 22,500 2.22 21,700 2.29 19,500 2.41 16,500 2.84
(S n 3) 6 25,400 2.55 23,700 2.61 21,700 2.70 19,500 2.84 16,500 3.12
6 1/4 25,400 2.97 23,700 3.04 21,700 3.15 19,500 3.31 16,500 3.63
5 1/2 15,600 1.89 15,600 1.94 15,600 2.00 15,600 2.10 15,600 2.30
4 1/2 aPi rgul 53/4 20,600 2.24 20,600 2.29 20,600 2.37 19,600 2.49 16,600 2.72
6 25,400 2.62 23,700 2.65 21,700 2.77 19,600 2.91 16,600 3.18
6 1/4 25,400 3.02 23,700 3.09 21,700 3.20 19,600 3.35 16,600 3.67
5 3/4 20,900 1.99 20,900 2.04 20,900 2.10 20,900 2.20 18,200 2.39
nc 44 6 26,500 2.36 25,500 2.41 23,500 2.49 21,300 2.61 18,200 2.84
6 1/4 27,300 2.76 25,500 2.82 23,500 2.91 21,300 3.04 18,200 3.31
6 1/2 27,300 3.19 25,500 3.25 23,500 3.36 21,300 3.51 18,200 3.82
5 1/2 13,000 1.60 13,000 1.85 13,000 1.71 13,000 1.85 13,000 1.93
5 3/4 18,100 1.92 18,100 1.97 18,100 2.06 18,100 2.22 17,900 2.36
4 1/2 FH 6 23,600 2.28 23,600 2.33 23,000 2.42 19,900 2.81 17,900 2.766 1/4 27,300 2.64 25,300 2.71 23,000 2.82 19,900 3.04 17,900 3.24
6 1/2 27,300 3.03 25,300 3.12 23,000 3.25 19,900 3.50 17,900 3.73
4 1/2 XH 53/4 17,700 1.68 17,700 1.74 17,700 1.87 17,700 1.97
nc 46 6 23,400 2.02 23,400 2.09 22,400 2.24 20,300 2.37
4 iF 6 1/4 28,000 2.38 25,700 2.47 22,400 2.64 20,300 2.79
5 dbl. Sml 6 1/2 28,000 2.77 25,700 2.87 22,400 3.07 20,300 3.25
4 1/2 M. op 63/4 28,000 3.18 25,700 3.30 22,400 3.57 20,300 3.74
5 3/4 18,000 1.83 18,000 1.69 18,000 1.80 18,000 1.90
6 23,700 1.95 23,700 2.02 23,200 2.16 21,100 2.28
4 1/2 H-90 61/4 28,700 2.30 26,400 2.38 23,200 2.54 21,100 2.69
(S n 5) 6 1/2 28,700 2.88 26,400 2.77 23,200 2.96 21,100 3.12
6 3/4 28,700 3.08 26,400 3.19 23,200 3.40 21,100 3.59
6 1/4 25,400 1.80 25,400 1.85 25,400 1.95 25,400 2.03 24,000 2.18
5 H-90 6 1/2 31,900 2.12 31,900 2.17 29,400 2.29 27,200 2.38 24,000 2.56
(S n 5) 6 3/4 35,300 2.45 32,900 2.52 29,400 2.65 27,200 2.76 24,000 2.97
4. In each connection size and type, group torque values apply to all connect ion types in the group when used with same dril l collar OD and bore;i.e., 2 3/8 IF, API NC26 and 2 7/8 Slim Hole connections,used with 3 1/2 x 1 1/4 drill collars, all have the same minimum make-up torque of 4600 ft-lb and the box is the weaker member.
5. Stress-relief features are disregarded for make-up torque calculation.6. H-90 connection make-up torque is based on 56,200 psi stress and other factors, as listed in note 1.7. 2 7/8 PAC make-up torque is based on 87,500 psi stress and other factors, as listed in note 1.8. Conventional recommended BSR tanges do not apply to Double-Shouldered connection (HT, XT, GPDS) designs. Current industry target BSR
ranges should not be used as an indicator of Double-Shouldered acceptance/rejection.9. Torque figures in bold indicate that the weaker member for the corresponding OD and bore is the box. For all other torque values, the weaker
member is the pin.
d r i L L c o L L a r S
Drill Collars Recommended Make-Up Torque and Bending Strength Ratios
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106
Sz typ dll cll B (.)
f c od 2 1/4 21/2 2
13/16 3 31/4 3
1/2 33/4
. f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr lb/f BSr
6 1/4 23,000 1.59 23,000 1.63 23,000 1.71 23,000 1.77 23,000 1.89
4 1/2 iF 61/2 29,700 1.89 29,700 1.93 29,700 2.03 29,700 2.10 26,700 2.24
aPi nc 50 6 3/4 36,700 2.21 35,800 2.26 32,300 2.37 30,000 2.46 26,700 2.62
5 XH 7 38,400 2.54 35,800 2.61 32,300 2.73 30,000 2.83 26,700 3.02
5 M. op 7 1/4 38,400 2.91 35,800 2.98 32,300 3.12 30,000 3.24 26,700 3.45
5 1/2 dbl. Sml 71/2 38,400 3.29 35,800 3.38 32,300 3.53 30,000 3.17 26,700 3.91
6 3/4 34,500 1.94 34,500 1.98 34,500 2.06 34,100 2.13 30,800 2.25
5 1/2 H-90 7 42,000 2.25 40,100 2.30 36,500 2.39 34,100 2.46 30,800 2.60
(S n 5) 7 1/4 42,700 2.57 40,100 2.63 36,500 2.73 34,100 2.82 30,800 2.98
7 1/2 42,700 2.92 40,100 2.98 36,500 3.10 34,100 3.20 30,800 3.38
6 3/4 31,900 2.07 31,900 2.11 31,900 2.20 31,900 2.72 30,500 2.40
5 1/2 aPi rgul 7 39,400 2.37 39,400 2.42 36,200 2.52 33,900 2.60 30,500 2.75
7 1/4 42,500 2.70 39,900 2.76 36,200 2.87 33,900 2.96 30,500 3.13
7 1/2 42,500 3.04 39,900 3.11 36,200 3.23 33,900 3.34 30,500 3.53
7 32,800 1.64 32,800 1.67 32,800 1.72 32,800 1.76 32,800 1.83
5 1/2 aPi FH 71/4 41,000 1.91 41,000 1.95 41,000 2.00 41,000 2.05 41,000 2.14
7 1/2 49,700 2.20 49,700 2.24 47,800 2.30 45,200 2.36 41,500 2.45
7 3/4 54,500 2.50 51,700 2.54 47,800 2.62 45,200 2.68 41,500 2.79
7 1/4 40,500 2.05 40,500 2.11 40,500 2.16 40,500 2.24
nc 56 7 1/2 50,000 2.33 48,200 2.39 45,600 2.45 42,100 2.55
7 3/4 52,100 2.62 48,200 2.70 45,600 2.76 42,100 2.87
8 52,100 2.94 48,200 3.02 45,600 3.09 42,100 3.21
7 1/2 46,400 1.96 46,400 2.01 46,400 2.05 46,400 2.12
6 5/8 aPi rgul 7 3/4 55,600 2.24 53,300 2.30 50,700 2.35 46,900 2.438 57,400 2.54 53,300 2.60 50,700 2.66 46,900 2.75
8 1/4 57,400 2.85 53,300 2.93 50,700 2.99 46,900 3.10
7 1/2 46,500 1.84 46,500 1.89 46,500 1.92 46,500 1.99
6 5/8 H-90 73/4 55,700 2.11 55,700 2.16 53,600 2.20 49,900 2.27
(S n 5) 8 60,300 2.39 56,300 2.45 53,600 2.49 49,900 2.58
8 1/4 60,300 2.69 56,300 2.75 53,600 2.80 49,900 2.90
8 55,100 2.03 55,100 2.07 55,100 2.10 55,100 2.16
8 1/4 65,400 2.28 65,400 2.32 65,400 2.36 61,600 2.42
nc 61 8 1/2 72,700 2.54 68,400 2.59 65,600 2.63 61,600 2.70
8 3/4 72,700 2.82 68,400 2.87 65,600 2.92 61,600 2.99
9 72,700 3.11 68,400 3.17 65,600 3.22 61,600 3.30
8 56,600 1.82 56,600 1.85 56,600 1.88 56,600 1.93 56,600 1.99
8 1/4
67,100 2.07 67,100 2.11 67,100 2.14 63,400 2.19 59,000 2.26
5 1/2 iF 81/2 74,600 2.33 70,300 2.37 67,400 2.41 63,400 2.47 59,000 2.55
8 3/4 74,600 2.60 70,300 2.65 67,400 2.69 63,400 2.76 59,000 2.85
9 74,600 2.89 70,300 2.95 67,400 2.99 63,400 3.06 59,000 3.16
9 1/4 74,600 3.20 70,300 3.26 67,400 3.30 63,400 3.39 59,000 3.50
8 1/2 67,800 1.88 67,800 1.91 67,800 1.93 67,800 1.97 67,800 2.02 67,200 2.09
8 3/4 79,500 2.12 79,500 2.15 79,500 2.18 76,700 2.23 72,100 2.28 67,200 2.36
6 5/8 FH 9 88,600 2.30 84,000 2.41 81,000 2.44 76,700 2.49 72,100 2.56 67,200 2.64
9 1/4 88,600 2.64 84,000 2.68 81,000 2.72 76,700 2.77 72,100 2.85 67,200 2.94
9 1/2 88,600 2.92 84,000 2.97 81,000 3.00 76,700 3.07 72,100 3.15 67,200 3.25
f-lb (S n 2)
G r a n t P r i d e c o
Drill Collars Recommended Make-Up Torque and Bending Strength Ratios
Grant Prideco. All rights reserved. December 2003
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7/30/2019 Drill Collars
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Sz typ dll cll B (.)
f c od 2 1/2 213/16 3 3
1/4 31/2 3
3/4. f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr f-lb BSr
9 75,800 1.87 75,800 1.89 75,800 1.91 75,800 1.93 75,800 1.97 75,800 2.02 9 1/4 88,800 2.08 88,800 2.10 88,800 2.12 88,800 2.15 88,800 2.19 88,800 2.24
nc 70 9 1/2 102,400 2.29 102,400 2.32 102,400 2.34 101,100 2.37 96,200 2.41 91,000 2.47
9 3/4 113,700 2.52 108,800 2.55 105,700 2.57 101,100 2.60 96,200 2.65 91,000 2.71
10 113,700 2.76 108,800 2.79 105,700 2.81 101,100 2.85 96,200 2.90 91,000 2.97
10 1/4 113,700 3.01 108,800 3.04 105,700 3.06 101,100 3.11 96,200 3.17 91,000 3.24
10 108,200 1.94 108,200 1.95 108,200 1.96 108,200 1.98 108,200 2.01 108,200 2.04
10 1/4 124,100 2.13 124,100 2.14 124,100 2.16 124,100 2.10 124,100 2.20 124,100 2.24
nc 77 10 1/2 140,500 2.33 140,500 2.34 140,500 2.36 140,500 2.38 135,100 2.41 129,400 2.44
10 3/4 154,300 2.53 149,000 2.55 145,500 2.56 140,500 2.59 135,100 2.62 129,400 2.66
11 154,300 2.75 149,000 2.77 145,500 2.78 140,500 2.81 135,100 2.84 129,400 2.89
8 53,500 1.90 53,500 1.94 53,500 1.96 53,500 2.01 53,500 2.07 53,500 2.16
7 H-90 8 1/4 63,700 2.14 63,700 2.18 63,700 2.21 63,700 2.26 61,000 2.33 56,400 2.42
(S n 5) 8 1/2 74,500 2.39 72,100 2.43 69,300 2.46 65,300 2.52 61,000 2.60 56,400 2.70
8 1/2 60,400 1.80 60,400 1.83 60,400 1.84 60,400 1.88 60,400 1.92 60,400 1.98
8 3/4 72,200 2.02 72,200 2.05 72,200 2.07 72,200 2.11 72,200 2.16 72,200 2.22
7 5/8 aPi rgul 9 84,400 2.25 84,400 2.28 84,400 2.31 84,200 2.35 79,500 2.40 74,500 2.47
9 1/4 96,300 2.49 91,600 2.53 88,600 2.55 84,200 2.60 79,500 2.66 74,500 2.74
9 1/2 96,300 2.75 91,600 2.78 88,600 2.81 84,200 2.87 79,500 2.93 74,500 3.02
9 73,000 1.76 73,000 1.78 73,000 1.79 73,000 1.81 73,000 1.84 73,000 1.88
7 5/8 H-90 91/4 86,000 1.95 86,000 1.97 86,000 1.99 86,000 2.02 86,000 2.05 86,000 2.09
(S n 5) 9 1/2
99,500 2.16 99,500 2.18 99,500 2.20 99,500 2.23 99,500 2.27 96,300 2.31
10 109,300 1.96 109,300 1.97 109,300 1.98 109,300 2.00 109,300 2.03 109,300 2.06
8 5/8 aPi rgul 101/4 125,300 2.15 125,300 2.17 125,300 2.18 125,300 2.21 125,300 2.24 125,000 2.27
10 1/2 141,800 2.36 141,800 2.38 141,100 2.39 136,100 2.42 130,800 2.45 125,000 2.49
10 1/4 113,500 1.83 113,500 1.84 113,500 1.85 113,500 1.87 113,500 1.89 113,500 1.91
8 5/8 H-90 (S n 5) 101/2 130,100 2.01 130,100 2.02 130,100 2.03 130,100 2.05 130,100 2.07 130,100 1.09
8 3/4 68,100 2.70 68,100 2.73 67,300 2.80 62,800 2.88 58,100 3.00
7 H-90 (S n 5) 9 74,200 2.98 71,400 3.02 67,300 3.09 62,800 3.19 58,100 3.31
9 1/4 73,100 2.54 73,100 2.56 73,100 2.61 73,100 2.67 73,100 2.75
7 5/8 aPi rgul 91/2 86,500 2.79 86,500 2.82 86,500 2.87 82,500 2.94 77,300 3.03
9 3/4 94,900 3.06 91,800 3.10 87,300 3.15 82,500 3.23 77,300 3.32
10 94,900 3.35 91,800 3.38 87,300 3.44 82,500 3.52 77,300 3.63
9 3/
491,700 2.40 91,700 2.42 91,700 2.45 91,700 2.49 91,700 2.55
7 5/8 H-90 10 106,300 2.63 106,300 2.65 106,300 2.68 104,200 2.73 98,800 2.79
(S n 5) 10 1/4 117,100 2.87 113,900 2.89 109,200 2.93 104,200 2.98 98,800 3.04
10 1/2 117,100 3.12 113,900 3.14 109,200 3.18 104,200 3.24 98,800 3.31
10 3/4 112,900 2.61 112,900 2.64 112,900 2.67 112,900 2.72
8 5/8 aPi rgul 11 130,700 2.84 130,700 2.87 130,700 2.91 130,700 2.96
11 1/4 147,600 3.33 142,430 3.36 136,800 3.41 130,700 3.46
10 3/4 93,000 2.21 93,000 2.23 93,000 2.26 93,000 2.29
8 5/8 H-90 11 110,800 2.41 110,800 2.43 110,800 2.45 110,800 2.49
(S n 5) 11 1/4 129,200 2.61 129,200 2.63 129,200 2.66 129,200 2.69
f-lb (S n 2)
connectionS WitH LoW torQUe FaceS
While every effort has been made to insure the accuracy of the tables herein, this material is presented as a reference guide only. The technical information containedherein should not be construed as a recommendation. Grant Prideco cannot assume responsibility for the results obtained through the use of this material. Noexpressed or implied warranty is intended.
connectionS WitH FULL FaceS
d r i L L c o L L a r S
Drill Collars Recommended Make-Up Torque and Bending Strength Ratios
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7/30/2019 Drill Collars
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Initial Make-up
even though quality connections are heavily coated with phosphate, thread damage is not always prevented. A
generous and thorough application of high-quality thread dope (40 to 60% by weight metallic zinc minimum) will
help minimize galling.
New connections should be walked in with chain tongs. Always use the recommended make-up torque for the thread
design. Exercise care to maintain calibrated torque measuring and indicating gauges for future use. After initial make-up,
break-out the connection, clean and inspect the threads, faces and shoulders. Repair any minor damage. Re-lubricate and
re-torque the connection.
Repeat break-out and make-up a third time before going in the hole. Monitor break-out torque. It should be the same or
less than the make-up torque. High break-out torque is an indication of problems and the connection should be inspect-
ed for damage.
Maintenance
Use thread protectors on both connections when handling drill collars. Rotate breaks on each trip. Clean and inspect the
individual connections.
Qualified personnel should periodically conduct a magnetic particle/black light inspection. Collars that are left idle or put
in storage should be cleaned, inspected, repaired, and rust-proofed, as necessary, before installing thread protectors.
Bending Strength Ratios
Sizes less than 6 should have a BSR of 2.25:1 to 2.75:1. Conditions that require high rpm and small collars compared to the
hole size, use 2.25:1 to 3.00:1. If the rpm is kept low and the collars are closer to the hole size, use 2.25:1 to 3.20:1. In corro-
sive environments, use 2.50:1 to 3.00:1.
Although the current industry BSR calculation for single-shoulder RSC connection types may still be applicable for dou-
ble-shoulder connections (HT, XT, GPDS), the appropriate target ranges are yet to be defined due to limited industry expe-
rience and testing of available types/sizes. Testing performed to date indicates that current target BSR of 2.5 does not
apply to tested double-shoulder connections. Just as target BSR for single shoulder RSCs has taken many years of industryexperience to define, the same may be true for these relatively new double-shoulder offerings. Additionally, target BSRs
for double-shoulder connections may likely vary between connection types
(i.e. GPDS vs. XT). Current industry target BSR ranges should not be used as an indicator of double-shoulder
acceptance/rejection.
G r a n t P r i d e c o
CARE AND MAINTENANCE
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